SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '858f58bb36bd01f46e2563aca7afd026d93864ce50981e4a6860ee527c39d581' 
  AND token = 'P6FKEhDRkI/xHLy9+2NtGQjOjsGS5eU4OeCZLj/cfdw=' 
  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"
    }
  }
}