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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a582c6a66843541a4824041188513b0bae26d1ed8406d77b01172fd0adc8668' 
  AND token = 'ztXB1Z+DyKOlxj4XGWo5HIGC8SwpHpP3iGhkIAYoGkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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