SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '0f71eba826ac69e9aaf6f64a38621205d8558e59635467091479d2f2cd8d81e7' 
  AND token = '2IA9A8HCGw1FKvjZ52qgEwu/NPjZGQ1CUchT3TjS+dQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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