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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ab5a9730348de180f823467033c2ccb77bd740a6c98235158e697ff94f3fc6f' 
  AND token = 'e9qAFJPZdQHT7PSpo1oE7MqpLr7i7MbCqP++f86t1hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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