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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bd37e8db8adb20121383100dca80a5719f0642daa5d4d316de303d26dab7bce' 
  AND token = 'GgLqfaTpChESRAjnkEvAX7yHCun/9ju27oZ82MuNe2U=' 
  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"
    }
  }
}