SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc529b879e8fd77469dd122fab88a3a03d1fc8c5ff93e11ed423989f8961bd68' 
  AND token = 'aeq8ihZgV/6FGgO3wEcxwjTknwQoyRNJ1oKk+Gj+R1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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