SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f88fe81472f8a9387600c527b866b8ad7177e2d0aabfa02fc96edbfb4d0ae64b' 
  AND token = 'OqhZVvRH0zm1ulx9IbQYA9/bBAPXykOGj1WraMghyOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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