Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80b2a973ce9bc9c834fddc0e0b06de2abd9ecae8a3400330d5a83ed717496ee2' 
  AND token = 'Z/vo6Nr/FHQygQ9Y7EvTQUFB+pwQ1zzEECvR1uXHcnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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