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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc2c05488ca4cfad27a4413439327977189b40958e9e5dbeb06c303ccc39bf80' 
  AND token = 'kXp9a2RU2p3pBBciCIyEUW9gZeJUI6Q5oUhHQ3EWDb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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