Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '276056fc0ef76e1e4d3bd7fd4c8342bc173a9c7d1a5e682e3e9a9dceafebadb0' 
  AND token = 'ShHrVCjhtxQY3g2ttUP8WuyqgalDtMiXuyAbhQAC14w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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