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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fa88dd652b5f08d39a463a67c71596c9026a98194e304e03755d6ea0f2ada7b' 
  AND token = '9rowUheD6GYNG6zLvN+dPmVp6+LVCN9ZE9Lx9GwAeag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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