Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68544d8975637346b1333ce63b146c43682cf117c9019c167232ec66e842f74e' 
  AND token = '9WwJJ3n3D1D/Y9LgTzMRA9zXQvrr9HfLHRwO3F6n4Og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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