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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'a3ed1f3ee05c953c171976aa1ba7bd09e9d63d057b93a1b1d9e59276a692aaa8' 
  AND token = 'cmqGRmyiMi3BDEKgZq8cIhdlA4uZRszHhOQzs0AcdKE=' 
  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"
    }
  }
}