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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '8b4ea5d43e1de7fa3129c7307e9a2eb239407c937d72f5a4abe16e87ae1d8fba' 
  AND token = 'Xb50EOUPvbZL9OElX5RMAz/U41EXB3+PdCcgZaJsetE=' 
  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"
    }
  }
}