Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9521a6613d8b6b0a702097c3d490ea2ee69107f466f4096c3bc6cada9241a498' 
  AND token = 'fmW7rzXXkdu5HlgEKqapRKVAFBHqHctkO5mcsyxK8Ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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