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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'd51885a5c21c15820a24e23ed1223e4cebe984e8771456a8420d9c6d88facc5d' 
  AND token = 'Ws/3NrUEbF/DuvRGuPin6IkEwFZQ2H5IVk7inys9cBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00007

JSON explain

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