SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e076d35cffd5ea37e8515c393cb3fa9b37299013dcdf77bd401f3ca2bf7e4653' 
  AND token = 'RPHvL+CMXv/5KsUshD8ZQHL/9Xp6XZ0PklRGVK3v1Cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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