SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54d333f3bf10ba4dea6c56599ccd5625d893e82546c10c1fd7ac8e153385e124' 
  AND token = 'V6+dMQzKN2Oxji3G29veKqUL9jSHhR/yrlB81CTgtCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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