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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2caec0daa84c013eee32e59f741141bda0105c80255e1b7c81513305ec6a255c' 
  AND token = 'cC9zWlilYUiph6xmpzNCH8gR6KcTRI9s1k3oJSxK9js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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