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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efdbae884165b693714dc2faffa7dde6afec5596bff92e13ba70a9547a97d34a' 
  AND token = '+CZRbSXh4n7Si91Q9dPvkN1lPmX5eRaweNceK5z33PU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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