SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'b2d0f2f3657557403a5b32993754d0449e603739b42af266eed8b46b554a22dd' 
  AND token = 'BhYfwswOAaFU6VGPB7C55iJCFjF5TI612z+JC+QAGPY=' 
  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"
    }
  }
}