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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56964c35b6f9bc0b0d0dd1f784d22a44c83d14f09f63f5f591383eba11e985c7' 
  AND token = 'vdfGZ2HrFAIOKlbXivO3whTQebA1AIH+EV70n4ODWnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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