Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c94ab2c15ef5ed5005a300a2cf74a90c7a880266ec88c6520a6738e11c6ca207' 
  AND token = 't2+OFG4ZM1168AFuLebny02votzjROf8BYZ/pLuYQ6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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