Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0eec89d5074ef2f1e26c1bfe10d6558d7c92cb51d0bf491ba2a0d252f477b06' 
  AND token = '0t4T+wZJV5YbRTgA9w3wgKqbzAEwklEoI+M2gjkb0RU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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