Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a600fba43d09dad5548c9bebaefe8eac30b35381d7329ec7b56b673d068f571b' 
  AND token = '1q9tpToEQzn9gHFkwMIlcCm9AvQz3Dbsur6aQKgTSFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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