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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cabbf8b68db4a770dc06dcb9a975f8306f5bdf8e54da7a14aa6029bd1436a779' 
  AND token = 'lsJf0FHRnGHOmsPi3hXdEVElCeaQjkbYiBEJX2a+5gM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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