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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b39a8c782a77f3485864c012a77cf247efaeecd34873bb112e3ee3de08ad49a' 
  AND token = 'tIFoZT5HWfjjKmjwZN+9FPvIJOMtbL0XekDjX81WjRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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