SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '655b5956ebfb8ec6c6f9f8fc894d5953b7ce2f94a7be13157f430ab6b7d73389' 
  AND token = 'ip7RRFphuzzrPw3Ggx2WYBIKzZvx1SXXrYvA+DX6hps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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