SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92bf289fece9936248d5668f8b7d79f679066ddd63f1ee28941ae5e4c2c57dbc' 
  AND token = 'TI7WMXB6spkC9ZEqKeOJ7ziClnMQA8+KN8wY2wVXsvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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