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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21d0abd9cd856eae8ace1da7f7dd5e31fb14b9876c6a245d9b5b6f1ebc807bfd' 
  AND token = 'vyesE4qOr8f9YIMhv7HSKt0qIPfQdRqe+Mjn/LLFj0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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