SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a48f024c225fee10bb29f9396b6e6f7277328b8c0e9d477503e507c3396c26bc' 
  AND token = 'HBwlQHTFTdZG/sqihCLKIyhSaG+iJJy1rYRXRUkapUA=' 
  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"
    }
  }
}