Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0ad3b4fcb025d0ece5c30f08a7a70aef1c90f73612f9bdd23d98d18882692eb' 
  AND token = '7tAJjYUi8lKQBX0pYZ1jb81UACbf0V68nt/VOLRHO4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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