Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce94204acd324f9cfbf099d96a1e3230208c422624eec6c7031aaa3fa5da1996' 
  AND token = 'gOuO2Oj4ASrFy33DE8BNIliQed6NvqISqCB5JTMfLdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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