SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8d23a89115c9d47a04f362996e1e10ac6a276d7414f65b785cd956bf4b07e09' 
  AND token = 'z2w8J8IjlW8pixGHBXuUfyqta8eVMpgjFJWgXOaqOYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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