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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '1cb8bf5f2d988d89f0c00b43415282eab237767360cd60473cd36bb0397762e3' 
  AND token = '2yUl5q6i5VXfDC7OKcL24OQnvg+S6KLu3x+I6uvkF8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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