Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fbe418f3da5840df36aa996af200f0e312acc2326c49bb35dd028f7c18cf03e' 
  AND token = 'QTMGfoILMjfDLlSMhxXOw9RYkCQpQnaxvx8cAvR353c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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