SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4b530b83c3fd4b697488bf37e57d4393856f1f421c85bebe573265b03028ba0' 
  AND token = 'oKUtp3F7KOOPBl61Lg3+kqzjiURGn2CIJRhOWk0O5xA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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