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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'a4992dbfe175166838acddbaf3d9e94d9cd88b71a952f2e2a29345130e14d81b' 
  AND token = 'OQ1mycSLw1QZTB9sBg6uQda7Z7PYlO/cw7eN4bQaTFo=' 
  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"
    }
  }
}