SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '453ff525c13bcdb49254868dcd67bf2887fa6f4e9c2bed7b2c12d7aca3d207a2' 
  AND token = 'zHYVl2jUlET9bnCfJ3cu+XwFQOIGJquSZEy9hJAja5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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