Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ace9d6cbf0c9f56f5d4cc37aeae78110228df2f5a9a71fd37bd38f48e8f3ea9a' 
  AND token = 'da0usQW7xy5iiMEQSm63szTvolZTchskAJ85Z9UfYV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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