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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0c25984b10082a0ae7b8bb2ffaa436628c8d58c2da6147d619f02a7b44b1fe4' 
  AND token = 'I7WQVJV5KV0V6nfgHQpnIga8THxILUhGeQmRuT0RiW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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