Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aad8dfab27265fefece5ed01bf5a1c6dd0e56d8a3a7b9d908b73cc3207010db4' 
  AND token = 'sbfXJa09Wbs+63DsP0aplG4vsgglPBfzYIgJI97R4Sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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