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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ce23b59d8333c2e1eb4fd772db3ab80cf54094b2db8b28f664ee6ab8b2deed9' 
  AND token = 'z9ddJMFmW7UaSc8Jr7ErJFq+Joko68vWUhZChWWPtUc=' 
  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"
    }
  }
}