Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe4b7029e611c56c504e4ce8585771407cfa91d9291fc3e28e4442dc828e047d' 
  AND token = '3HfOBe9kIS5qcdqjj/lEVZXMBWn/YHUak4tEI67x8Ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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