SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00ad2ac5b44a4f999d1a380eddde31bc4eff1734f570c95e66df88bddcf78960' 
  AND token = 'oW+OFJjUX81cYQt5jrhZakG7RKxZVuBPiPx7FZ7JUGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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