Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc12700001e8f9b60834b37e8b2c26cfbc07cf495e96e258f80dabeb863c0976' 
  AND token = 'DYg7/nQhx8ehHfElECSmMUIk1K/QaHs4idzB4tL+SU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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