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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a28f6f7cde40057a24fe9e0bfc0d7532976a23f73f82e1f471a2edddbe4ba3dd' 
  AND token = 'C+aLTdGjFMwloV/Ef8WmK6cjya9+1C1ncvgj8DmrdnI=' 
  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"
    }
  }
}