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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '46a6e4276850352182b9928bd075d5ebf33b027d74c74439783fee1cf46aae9a' 
  AND token = 'ReyZfC7+j3vFnSqceGtyHbXiEQrdMPvAJdeRCrIr9Uc=' 
  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"
    }
  }
}