SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd48370fc113a425ffad237202d4638b74c92b936e457fdf51d6867760b64179a' 
  AND token = 'efVUqJO5niXjnmCv2V43vdUF4SZn9FfHg8p2+IT/Koo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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