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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'cf1e60c3299624afe40c8ed72efa5be14ea3b174a2144aefeda1caabb8993a8f' 
  AND token = '3KhVnQj/dr6K3hPh+PvaTzVWbFaLP+kDssMpO4jC8JM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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