SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'b42289348157c7e9a80e3158ec6d1b835014ff9db3961f2692fbbc0ec856f3df' 
  AND token = '4sX0fmw7CQDlDXs6I2Wt9MfH4moshYGTnLnhZhGNJgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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