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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '6a9ceadbe5373d50a25126bbde360f7344f2a5596507ca1ac690f828759ea11c' 
  AND token = '6EWnc2JZZM98e63Vt+Xr9S1lwREx092Rkmhu7v9tltQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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