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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'f86b550403722ea503a9652314a2df63baa47da7da0fa36d78255a7e246421d7' 
  AND token = 'xUn4bhBf+ATBLJgtYex3jFiE3lkXu3+kvY/yDJze6Ys=' 
  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"
    }
  }
}