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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eb35708a59ecd76ff6f7b28e4ad0092d86221864c1d0c04b422f80cb9d2fa05' 
  AND token = 'KkAhbZm27xgjlOBuYMD7Lw8e/aQOhZK+NRuw40L7+mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}