SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'b2e9be6fad4b8b3ec7d403354307652c1610dfe46153946f8dd7a2a32ba43a80' 
  AND token = 'CZvdTYzWCrIDYX8M+jWoxVtDMr01pLPlH3gKa45TywE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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