Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e49bc00b9c3074d326d08874a9d3e2f25b4682b1ac0c025e98e16d5ada540c0f' 
  AND token = 'hur9qzCE7PjM7nPI4vylIVq8N8r1ArhWP3acOWuiLBA=' 
  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"
    }
  }
}