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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c15a2127e17e797ed1a482574057d78824d03ae1da1b38c14ca22830bceb3ef' 
  AND token = 'gCVZJJeAUYgmKG12DCQoGzBC7LfsVaLrvIS7GRW+380=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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