Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4575184c4c651d0643c433392b468954cab79b40e3df2e96522e9f62282e82f' 
  AND token = 'lORnr32tHCY8KnQ6b7got+7Gb/TWwSu/bqEdlKBXcoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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