Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e8ebd94bf90e1f6a74affd500708fbb241b09ba96498b93aea1098b2f4638d9' 
  AND token = 'xoSdD0UDvJO5Lj++//RfHoDhJDCqcwyzRkoc+EaDoYg=' 
  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"
    }
  }
}