Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e8408f4a699fe07d5f6b270d14e2870b58c4914d0547a2ddbfb726886a93907' 
  AND token = 'BztphI+gN4tHP7O1NlO3v5S4jfzgqVC7x84DglEOztQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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