Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1d735bf32e8b6afe0e909a3983d38c33e70cb1d8050dca28e892659ac8dcdf5' 
  AND token = 'jbFR5MZTq+qxSjOTW2/s8C/FsLVzB+IiINY514hOgBc=' 
  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"
    }
  }
}