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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'b31e5c299056608888fe4e458fc2f81230e24b8606fc9034e8ca73ff9aaec1d8' 
  AND token = 'Sp5UPoL8C+pbaNY9n1nzwD8uk4pQR5UnpZOIhy8z+aU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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