Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7167294cd10c6b5653e3d31e5bcc091e988cd4dde152a9dc0cbee2ed82c8f4c4' 
  AND token = 'a3X7Eq4XZbqIgQZ5fYHBvbH/z/739yf4PBf8Ml4TYTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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