Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a93dbd6d17f222c1120400680e29a269f52adaa8855b01b05ce9968fcd676e2' 
  AND token = 'vCBJ0XVQ8ueQ8q8rfvDmROnR+ztx5AsA257zXCuEYgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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