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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '716118d6c3a36fdedec3567e9836cafcb531d91800f6e710cff3c15a6a1038d5' 
  AND token = 'vH9/feMJTAqbZpt3Te2Wam/BPjkfH1vTT9UMi6CZ4I8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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