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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d7b46d61029627620337f1ae69d5fa77d75f1497da2c0791909d5a99b5588cc' 
  AND token = 'wXdJ0iDALj+pwmPWqEYN71kEn02rk5b08WLpCDvEeyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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