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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b59ac022b35cd82a1d29f5624706fbf96dea59f781d8ef3aeed21e7a8946353' 
  AND token = 'Ep1K02bWZdnbJyXabIqkV/iMntg7gldni4yf18W0sLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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