SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '6ad9b67e961d1362eb715375be5b51a156197fc8d1b5be4feb7e20adb4910ba8' 
  AND token = 'LVCpKW6RBDr8v1B9pZwHgIcqCuZJtzSYZsIZ/nCeVtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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