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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bcbdabc76d77d84ac3eace4143afbb3cff286b3583cd486e3421a26f2822309' 
  AND token = 'dz9ZkbENnCI12qwQQk/63XBG5MlHQr/6/3WxTfgrJ2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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