Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ada287bc9221f4d938bd0bb1259a44aaf4565be47deb7b4ab9bb556e7fef2fba' 
  AND token = 'pbCL7PX7aQeId1DtNBCnAjcQE/FAJCbyyxam/9sDJpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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