Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fefe53834a74c67a6afb33820724e0d4c0afe81ec90b2e113aa048bf90c8649' 
  AND token = 'VKdZaBBs4LHVr+/0/ffaOXYcP5grYxpVEV6QLtzwLXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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