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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '9a5c134475b51c3815d5f9a68892bf37050ab9fc0be7b4c6cc5b481ba5d8a50d' 
  AND token = 'yLckFwkPV3QfpsKbsJFtbNZZoWAYFDT/eoXx4nl56Zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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