Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd840ac2849b0783fbd4d4030b775c90a5f8bf084ec8719898a3f9dc7ca8b3f7a' 
  AND token = 'P8UJUV/usKOz0kRRv16JrvRurOByXRHQP9vTZ1zNEyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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