SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adbe847ae451660b762255de63c0ac81225873a2df8e729a86382a07175f5005' 
  AND token = '/VxVAx+2rwmoa+hXZv2IUz/8pxkGJc03qdFKeXsh81Y=' 
  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"
    }
  }
}