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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccc0cc3da384607a5ac013a049de2f344bc43da200ce8fe85554ef11e0b330d4' 
  AND token = 'iJy8gOGEt5hcdSKF6ltVklHqmlKSwXWdDKmAG3+hgHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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