Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22dfad4109e19104492f0d987b26adfdcdd863cd9ffe33e1e4e7f7f98ce3f60f' 
  AND token = 'rD1A/7lw4HQBYQPgyeS4Tu2ZZHvOZvK3cOLRhH++P6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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