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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a2adb846e7e085d4fd596039c3f7f6b531c875b2bb7b11391b4100dbe12a582' 
  AND token = 'vpYD3cPQNk4C1MEe9lnSV5fhTPAqza6nc6K2/uA9fcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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